Segment reporting - Schedule of Geographical Information (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 5.9	$ 18.3	$ 13.4	$ 7.3
Non-current assets	257.8	737.0	196.7	45.0
Canada
Segment Reporting Information [Line Items]
Revenue	0.9	1.0	4.1	3.0
Non-current assets	31.6	57.0	23.0	10.8
United States
Segment Reporting Information [Line Items]
Revenue	5.0	16.3	9.3	4.3
Non-current assets	212.0	618.9	160.6	34.2
Germany
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	0.0	0.0
Non-current assets	11.7	34.9	10.8	0.0
Other
Segment Reporting Information [Line Items]
Revenue	0.0	1.0	0.0	0.0
Non-current assets	$ 2.5	$ 26.2	$ 2.3	$ 0.0